Top Spam Botnet, ?Grum,? Unplugged
Roughly five years after it burst onto the malware scene, the notorious Grum spam botnet has been disconnected from the Internet. Grum has consistently been among the top three biggest sources of junk email, a crime machine capable of blasting 18 billion messages per day and responsible for sending about one-third of all spam.
Source: Top Spam Botnet, ?Grum,? Unplugged